<template>
  <div class='list' ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">
          当前城市
        </div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">
              {{this.currentCity}}
              <!-- {{this.$store.state.city}} -->
            </div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">
          热门城市
        </div>
        <div class="button-list">
          <div class="button-wrapper" v-for="item in hotCities" :key="item.id" @click="handleCityClick(item.name)">
            <div class="button">
              {{item.name}}
            </div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(items,key) in cities" :key="key" :ref="key">
        <div class="title border-topbottom">
          {{key}}
        </div>
        <div class="item-list">
          <div class="item border-bottom"
          v-for="item in items"
          :key="item.id"
          @click="handleCityClick(item.name)"
          >
            {{item.name}}
           </div><!-- @click="handleCityClick(item.name)"也是将读取到的城市替换为vuex中的数据，在当前城市和首页展现出来 -->
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import Bscroll from 'better-scroll'
import { mapState, mapActions } from 'vuex'
export default {
  name: 'CityList',
  props: {
    cities: Object,
    hotCities: Array,
    letter: String
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    ...mapActions(['changeCity']),
    handleCityClick (city) {
      this.changeCity(city)
      // this.$store.dispatch('changeCity', city)
      this.$router.push('/')
    }
  },
  watch: {
    //  利用侦听器监听letter属性的变化
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0] // 获取最外层的key
        // console.log(element)
        // 获取城市的字母dom元素
        this.scroll.scrollToElement(element)
        // 如果letter不为空，调用better-scroll的。scrollToElement（）方法，
        // 可以让better-scroll自动滚动到某一个元素上
      }
    }
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  }
}
</script>
<style lang="stylus" scoped>
@import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color #ccc
    &:after
      border-color #ccc
  .border-bottom
    &:before
      border-color #ccc
  .list
    overflow hidden
    position absolute
    top 1.58rem
    left 0
    right 0
    bottom 0
    .title
      line-height .54rem
      background #eee
      padding-left .2rem
      font-size .26rem
    .button-list
      padding .1rem .6rem .1rem .1rem
      overflow hidden
      .button-wrapper
        width 33.33%
        float left
        .button
          margin .1rem
          text-align center
          border .02rem solid #ccc
          padding .1rem 0
          border-radius .08rem
    .item-list
      .item
        line-height .76rem
        color #666
        padding-left .2rem

</style>
